package com.itheima.aop;

import cn.hutool.core.util.ArrayUtil;
import com.itheima.Context.BaseContext;
import com.itheima.annotation.AutoFill;
import com.itheima.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAop {
    @Pointcut("execution(* com.itheima.mapper.*.*(..)) && @annotation(com.itheima.annotation.AutoFill)")
    public void autoFillPointcut() {}

    @Before("autoFillPointcut()")
    public void before(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature method = (MethodSignature)joinPoint.getSignature();
        AutoFill autoFill = method.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(ArrayUtil.isEmpty(args)){
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Integer id = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值

        if(operationType==OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime",LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);

                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    }
}
